6-10 Energy Questions!

6. Two trains are approaching each other. The first train has a mass of 2245 kg and is moving to the right at a velocity of 2.40 m/s. The second train has a mass of 1400 kg and is moving in the opposite direction of the first train at 7 m/s. If the second train continues to move left at a velocity of 2.25 m/s, what is the velocity of the first train?

7. A 6.0 g spitball strikes a 0.50 kg stationary wooden block. If the spitball becomes stuck to the block, and the block with the embedded spitball moves off at a velocity of 0.60 m/s, what is the initial velocity of the spitball?

8. A 30 g nurf projectile is fired from a 1.5 kg nurf gun. If the velocity of the
projectile is 10 m/s. what is the recoil velocity of the nurf gun?

9. An object explodes into three equal masses. The first object moves east at a velocity of 10.0 m/s. The second mass moves with a velocity of 15.0 m/s 45.0o S of E, what is the velocity and direction of the last mass?

10. A 117.9 kg Zdeno Chara is moving east at a velocity of 10.0 m/s when it collides with a stationary 98.4 kg Roberto Luongo. After the collision the Chara is travelling at a velocity of 5.2 m/s 20.0o S of E (or 340o). What is the velocity of the goalie after the collision?